??????????????????????????????

岩石组分和裂缝是影响致密砂岩气藏损害程度的重要因素，研究岩石组分和裂缝对致密砂岩气藏应力敏感性影响能够为钻井、完井作业及开发致密砂岩气藏中的储层保护提供基础参数。文章以鄂尔多斯盆地北部上古生界致密砂岩气藏盒1段、山1段及太原组三个层位为研究对象，选取基块及裂缝岩样进行应力敏感性实验，采用应力敏感性系数S_s对实验结果进行评价。不同层位基块岩样对比显示岩屑含量越高其应力敏感性越强，同一层位基块岩样与裂缝岩样的应力敏感性系数对比表明裂缝的存在大大增加了致密砂岩储层应力敏感性。

INFLUENCE OF THE ROCK COMPONENTS AND FRACTURES ON TIGHT SANDSTONE STRESS SENSITIVITY

The rock components and fractures are the important factors of influencing the degree of tight sandstone gas reservoir′s being damaged. Through studying the influence of the rock components and fractures on tight sandstone gas reservoir stress sensitivity，some basic parameters can be provided for protecting the reservoir in the processes of drilling，well completion and reservoir development. By taking the three horizons，i.e. He 1 member，Shan 1 member and Taiyuan Formation，in the Upper Paleozoic tight sandstone gas reservoirs in North E′erduosi Basin as the research objects，the stress sensitivity experiments of the matrix and fracture rock samples selected were carried out and the experimental results were evaluated by use of the stree sensitivity coefficients，Ss. In contrast with the matrix rock samples collected from different horizons，it was shown that the higher the detritus content，the stronger the stress sensitivity；and，as compared with the stress sensitivity coefficients of the matrix and fracture rock examples collected from the same horizon，it was indicated that the existence of fractures will greatly increase the tight sandstone reservoir stress sensitivity.